A carter oil pressure switch A68301 has a normally open contact and a normally closed contact. You could wire the oil light to the NC terminal and ground the hour meter to the NO terminal. Hour meter will only run when there is oil pressure.
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Rusty 149 project with:
QA42 snow thrower
38" deck
Barn fresh 1811 with:
44c mowing deck
QA42A snow thrower
42" snow blade
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